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30858dafd1
Add a simple test of the CMSDK APB timer, since we're about to do some refactoring of how it is clocked. Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org> Reviewed-by: Luc Michel <luc@lmichel.fr> Tested-by: Philippe Mathieu-Daudé <f4bug@amsat.org> Message-id: 20210128114145.20536-4-peter.maydell@linaro.org Message-id: 20210121190622.22000-4-peter.maydell@linaro.org
76 lines
2.1 KiB
C
76 lines
2.1 KiB
C
/*
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* QTest testcase for the CMSDK APB timer device
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*
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* Copyright (c) 2021 Linaro Limited
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*/
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#include "qemu/osdep.h"
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#include "libqtest-single.h"
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/* IoTKit/ARMSSE-200 timer0; driven at 25MHz in mps2-an385, so 40ns per tick */
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#define TIMER_BASE 0x40000000
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#define CTRL 0
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#define VALUE 4
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#define RELOAD 8
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#define INTSTATUS 0xc
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static void test_timer(void)
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{
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g_assert_true(readl(TIMER_BASE + INTSTATUS) == 0);
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/* Start timer: will fire after 40 * 1000 == 40000 ns */
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writel(TIMER_BASE + RELOAD, 1000);
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writel(TIMER_BASE + CTRL, 9);
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/* Step to just past the 500th tick and check VALUE */
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clock_step(40 * 500 + 1);
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g_assert_cmpuint(readl(TIMER_BASE + INTSTATUS), ==, 0);
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g_assert_cmpuint(readl(TIMER_BASE + VALUE), ==, 500);
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/* Just past the 1000th tick: timer should have fired */
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clock_step(40 * 500);
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g_assert_cmpuint(readl(TIMER_BASE + INTSTATUS), ==, 1);
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g_assert_cmpuint(readl(TIMER_BASE + VALUE), ==, 0);
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/* VALUE reloads at the following tick */
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clock_step(40);
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g_assert_cmpuint(readl(TIMER_BASE + VALUE), ==, 1000);
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/* Check write-1-to-clear behaviour of INTSTATUS */
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writel(TIMER_BASE + INTSTATUS, 0);
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g_assert_cmpuint(readl(TIMER_BASE + INTSTATUS), ==, 1);
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writel(TIMER_BASE + INTSTATUS, 1);
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g_assert_cmpuint(readl(TIMER_BASE + INTSTATUS), ==, 0);
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/* Turn off the timer */
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writel(TIMER_BASE + CTRL, 0);
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}
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int main(int argc, char **argv)
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{
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int r;
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g_test_init(&argc, &argv, NULL);
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qtest_start("-machine mps2-an385");
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qtest_add_func("/cmsdk-apb-timer/timer", test_timer);
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r = g_test_run();
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qtest_end();
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return r;
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}
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